Object size too big?

#1
Object size too big?

Hi there,
I've been doing some experiments. Because I'm used to Modeling from a CAD point of view (VectorWorks) I'm used to things having "real world" sizes. So, I was trying to understand how the Size Properties worked in Cheetah and I made a "big" box.

I couldn't find it.

If you look at the screen shot; each of the views has been zoomed to the extent of the object with the "Focus" tool, however in the Left (lower left), and Front (top right) the object has disappeared.
Note also, in the Camera view (top left) it's as if there is a curtain cutting through the object. If I zoom the Camera in or out, more or less of the Box will come out from the grey void.



It doesn't matter if the Style is wireframe or OpenGL: part of it is hidden, but it does render completely.

What's going on here?

N.
 

Jake

New member
#2
propstuff,

That effect is called clipping. It happens in all 3d programs. Go to you camera setting and change the clip settings to .01 or less and the model should show up again.

I'm not sure why this happens. Martin could explain it better. In Lightwave there is a check box to click when clipping occurs on the close work. That would be a nice feature.
 
#3
Jake,
you where almost right. But if the back of the object will be clipped you have to increase the far clipping plane.
So to display a big scene correctly just set the "clip far" parameter of the camera object to 10.000.

By,
Martin
 

Jake

New member
#4
Martin said:
Jake,
you where almost right. But if the back of the object will be clipped you have to increase the far clipping plane.
So to display a big scene correctly just set the "clip far" parameter of the camera object to 10.000.

By,
Martin
I guess I just looked at his images and I assumed that was an inside corner, not an outside. Should have read closer or looked at the grid. I have used a lot of 3d software and never, ever have I seen clipping BEHIND the object. You learn something everyday.
 
#5
Thanks for the info guys,

My 3D experience is limited to VectorWorks and there is no Clipping in that; you see everything that's in front of your view regardless of distance. (it just gets smaller and smaller)
I gather the intent of Clipping is to reduce the drawing load on the machine??

BTW, as far as sizes go; is there any "rationale" to the size Properties?
E.G. If I make a box, it defaults to a size of 1,1,1. What does the Size of 1 "mean"? Or to put it another way; If I imported 2 different models from, say, VectorWorks, where objects have "real" sizes, would their relative dimensions be maintained in Cheetah? (sorry, I just haven't had time to experiment much for myself)

thanks,
N.

forgot to add; the Clip Far was already set to 1000. -I must have been fooling with that previously ;-)
When I set it to 10000 it worked.
 
#6
propstuff said:
I gather the intent of Clipping is to reduce the drawing load on the machine??
That's mainly the reason for games. In 3D apps you crare more about numerical accuracy. You can't increase the far clipping plane arbitrarily.

But the adjustment of the clipping plan can be automated which I should do.

propstuff said:
BTW, as far as sizes go; is there any "rationale" to the size Properties?
E.G. If I make a box, it defaults to a size of 1,1,1. What does the Size of 1 "mean"? Or to put it another way; If I imported 2 different models from, say, VectorWorks, where objects have "real" sizes, would their relative dimensions be maintained in Cheetah? (sorry, I just haven't had time to experiment much for myself)
If you use the standard loader setting Cheetah3D scales the object to unit size. If you want to load in two object of differnet size you have to set the load scale factor to 1 in the loader preferences of the preferences window. A scale factor of zero means scaling to unit size.
 
Top